Rechargeable Battery Life Misunderstood?

I think I got the wrong idea about battery life. I bought a Swifter electronic broom about a year and a half ago. It ran nice! Great long battery life! I could do three cleanings before the need to recharge.

Now, I can’t get through one. My wife told me it came with two batteries. We dug up the other battery and charged it up. It doesn’t run any better than the original battery.

So what is it? Do batteries age even if not used? Should I order a replacement battery? Or, is it my device? There doesn’t appear to be anything wrong with it?

[quote=“Taiwan_Student”]Do batteries age even if not used? [/quote]Yes. Lithium ion batteries do. (the sort found in phones and laptops). They loose about 20% capacity per year depending on the temperature.